16. What type of muscle is found in arteries and veins? How does this differ between arteries and veins? What do veins have that arteries lack? What is the space in the middle of a blood vessel called?

Answer: smooth muscle; thicker in arteries; valves; lumen.

Blood pressure

17. What are the two factors that determine blood pressure? What is the equation for bood pressuer based on these factors (2 marks)?

Answer: cardiac output and peripheral resistance; BP = CO x PR.

Capillary exchange

18. What two factors determine capillary exchange? Which is larger at the arterial end of the capillary bed; what is the fluid in the tissues called?